Bump autoprefixer from 10.4.19 to 10.4.20 in /ui (#14842) #3076

Job	Run time
Build and publish to DockerHub (3.9)	15m 4s
Build and publish to DockerHub (3.10)	14m 45s
Build and publish to DockerHub (3.11)	14m 30s
Build and publish to DockerHub (3.12)	15m 16s
Build and publish to DockerHub (-conda, 3.9)	16m 1s
Build and publish to DockerHub (-conda, 3.10)	16m 46s
Build and publish to DockerHub (-conda, 3.11)	16m 20s
Build and publish to DockerHub (-conda, 3.12)	15m 33s
Build and publish to DockerHub (-kubernetes, 3.9)	17m 52s
Build and publish to DockerHub (-kubernetes, 3.10)	15m 17s
Build and publish to DockerHub (-kubernetes, 3.11)	15m 27s
Build and publish to DockerHub (-kubernetes, 3.12)	15m 53s
	3h 8m 44s

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